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Mack MP8

Discussion in 'Volvo Forum' started by steve092, Nov 29, 2023.

  1. Nov 29, 2023 #1
    steve092

    steve092 Light Load Member

    298
    79
    Dec 7, 2015
    0
    Hi guys I have a 2014 Mack CHU613 with misfiring issue and low fuel pressure.

    I recently replaced the engine harness filled with oil thinking the was my issue for the misfire. The fuel pressure is dropping after manually pumping the primer very quickly and can get the psi to about 25 to 30 for start up. Once started it will idle fine at 53psi and under full throttle it will drop down to 20psi than stall out.

    I noticed bubbles in the fuel tank after manually pump priming the truck, where do I start?

    Fuel psi gets in the low 60s under load than will drop to 20s
     
    steve092, Nov 29, 2023
    steve092, Nov 29, 2023
    #1
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  3. Nov 29, 2023 #2
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,788
    1,739
    Jun 14, 2009
    romulus,mi
    0
    Injector cups and injectors. Research it here or elsewhere. Been written about thousands of times.
     
    QUALITYTRUCK, Nov 29, 2023
    QUALITYTRUCK, Nov 29, 2023
    #2
    BobO1176 and JoeyJunk Thank this.
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